CN113149201A - Efficient autotrophic-heterotrophic coupling denitrification deep bed filter and method thereof - Google Patents
Efficient autotrophic-heterotrophic coupling denitrification deep bed filter and method thereof Download PDFInfo
- Publication number
- CN113149201A CN113149201A CN202110063451.XA CN202110063451A CN113149201A CN 113149201 A CN113149201 A CN 113149201A CN 202110063451 A CN202110063451 A CN 202110063451A CN 113149201 A CN113149201 A CN 113149201A
- Authority
- CN
- China
- Prior art keywords
- bed filter
- filter
- denitrification deep
- autotrophic
- heterotrophic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000008878 coupling Effects 0.000 title claims abstract description 26
- 238000010168 coupling process Methods 0.000 title claims abstract description 26
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000001651 autotrophic effect Effects 0.000 claims abstract description 116
- 238000011001 backwashing Methods 0.000 claims abstract description 43
- 239000000463 material Substances 0.000 claims abstract description 42
- 239000010865 sewage Substances 0.000 claims abstract description 40
- 238000002347 injection Methods 0.000 claims abstract description 30
- 239000007924 injection Substances 0.000 claims abstract description 30
- 239000006004 Quartz sand Substances 0.000 claims abstract description 24
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 91
- 238000009826 distribution Methods 0.000 claims description 22
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 21
- 229910052799 carbon Inorganic materials 0.000 claims description 21
- 239000011449 brick Substances 0.000 claims description 19
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 7
- 241001509286 Thiobacillus denitrificans Species 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical group [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 235000017281 sodium acetate Nutrition 0.000 claims description 5
- 239000001632 sodium acetate Substances 0.000 claims description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 4
- 229920001903 high density polyethylene Polymers 0.000 claims description 4
- 239000004700 high-density polyethylene Substances 0.000 claims description 4
- 238000011049 filling Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 2
- 239000004568 cement Substances 0.000 claims description 2
- 230000005484 gravity Effects 0.000 claims description 2
- 229910010272 inorganic material Inorganic materials 0.000 claims description 2
- 239000011147 inorganic material Substances 0.000 claims description 2
- 230000001788 irregular Effects 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 239000004575 stone Substances 0.000 claims description 2
- 238000004065 wastewater treatment Methods 0.000 claims 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 30
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 15
- 239000000945 filler Substances 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 108091006146 Channels Proteins 0.000 description 20
- 239000007789 gas Substances 0.000 description 14
- 238000005516 engineering process Methods 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 9
- 230000001580 bacterial effect Effects 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 6
- 230000014759 maintenance of location Effects 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 5
- 239000001257 hydrogen Substances 0.000 description 5
- 241000894006 Bacteria Species 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 229910002651 NO3 Inorganic materials 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
- 238000005201 scrubbing Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 244000005700 microbiome Species 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 241000282414 Homo sapiens Species 0.000 description 2
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012851 eutrophication Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 102000010637 Aquaporins Human genes 0.000 description 1
- 108010063290 Aquaporins Proteins 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000003851 biochemical process Effects 0.000 description 1
- 238000012258 culturing Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- -1 iron ions Chemical class 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002068 microbial inoculum Substances 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 1
- 235000019345 sodium thiosulphate Nutrition 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2826—Anaerobic digestion processes using anaerobic filters
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/286—Anaerobic digestion processes including two or more steps
Abstract
The invention discloses a high-efficiency autotrophic-heterotrophic coupling denitrification deep-bed filter, which relates to the technical field of deep-bed filters and comprises a heterotrophic denitrification deep-bed filter and an autotrophic denitrification deep-bed filter, wherein sewage sequentially passes through the heterotrophic denitrification deep-bed filter and the autotrophic denitrification deep-bed filter; a quartz sand filter material layer is filled in the heterotrophic denitrification deep bed filter tank, and an autotrophic denitrification filter material layer containing a high-efficiency autotrophic denitrification denitrifier is filled in the autotrophic denitrification deep bed filter tank; the bottom parts of the heterotrophic denitrification deep-bed filter tank and the autotrophic denitrification deep-bed filter tank are both connected with an air supply pipe a and a backwashing pipe fitting; the heterotrophic denitrification deep-bed filter tank and the autotrophic denitrification deep-bed filter tank are respectively provided with an embedded injection device in the filler zone. The invention also provides a method for treating sewage by the efficient autotrophic-heterotrophic coupling denitrification deep-bed filter, realizes efficient and low-energy-consumption deep removal of total nitrogen in sewage, and is worthy of popularization.
Description
Technical Field
The invention belongs to the technical field of deep bed filter tanks, and particularly relates to a high-efficiency autotrophic-heterotrophic coupling denitrification deep bed filter tank and a treatment method thereof.
Background
The eutrophication of the water body is a phenomenon which is more prominent in the problem of surface water pollution and seriously affects the production and the life of human beings, thereby not only reducing the ornamental value of the water body, but also harming the survival of human beings and organisms and increasing the sewage treatment cost. The increase of element nitrogen in the water body is one of the root causes of eutrophication, and various forms of nitrogen in nature can be converted into nitrate nitrogen to exist. With the continuous promotion of national and local governments on the improvement and modification requirements of secondary effluent quality standards of sewage treatment plants, how to efficiently denitrify water is the focus of attention of departments of all levels of governments and is also the difficult point of water environment treatment.
As a novel sewage treatment technology, the denitrification deep-bed filter tank becomes a hotspot for research and application in the field of municipal sewage deep denitrification treatment. The denitrification reaction in most denitrification deep bed filters running in the world at present is a biochemical process completed by a group of heterotrophic microorganisms. The method can achieve higher denitrification efficiency under the condition of sufficient carbon source in the treated water; however, when sewage with low C/N ratio is treated, an additional organic carbon source is required to be added to complete the denitrification process, and the amount of the added carbon source cannot be effectively controlled.
The autotrophic denitrification reaction can utilize reductive substances such as hydrogen, elemental sulfur, sulfide, iron or iron ions and the like as electron donors for denitrification, an additional organic carbon source is not needed, the discharge amount of residual sludge is small, and the system operation cost is greatly reduced. The utilization efficiency of the hydrogen is low due to the low solubility of the hydrogen in water, and the hydrogen is flammable and explosive, so that the transportation and the storage are inconvenient, the production cost is high, and the practical application of the hydrogen is greatly limited; the iron filter material contacts with oxygen to form rust to cause filler blockage, and the treatment effect is seriously influenced. In contrast, the sulfur autotrophic denitrification process is a research hotspot because of high denitrification efficiency, cheap filter material, easily available raw materials, stable working condition operation, and safer and more convenient transportation and use. However, autotrophic denitrification bacteria are slow in growth and reproduction and slow in denitrification rate, and can also produce secondary pollution of sulfate and cause pH reduction of effluent water and require additional alkalinity. Therefore, aiming at the defects of the prior heterotrophic denitrification deep-bed filter technology and the prior autotrophic denitrification deep-bed filter technology in the actual treatment process, the efficient autotrophic-heterotrophic coupling denitrification deep-bed filter technology is designed to solve the defects of the prior art, and the technology is a technology with great prospect at present.
Disclosure of Invention
The invention aims to provide a high-efficiency autotrophic-heterotrophic coupling denitrification deep-bed filter tank and a treatment method thereof aiming at the defects of the prior heterotrophic denitrification deep-bed filter tank technology and the autotrophic denitrification deep-bed filter tank technology in the actual treatment process, designs the high-efficiency autotrophic-heterotrophic coupling denitrification deep-bed filter tank technology, develops a high-efficiency autotrophic-heterotrophic coupling operation reactor, and realizes the deep removal of the total nitrogen in the sewage with high efficiency and low energy consumption.
The invention provides the following technical scheme: a high-efficiency autotrophic-heterotrophic coupling denitrification deep-bed filter tank comprises a heterotrophic denitrification deep-bed filter tank and an autotrophic denitrification deep-bed filter tank, sewage sequentially passes through the heterotrophic denitrification deep-bed filter tank and the autotrophic denitrification deep-bed filter tank, both sides of the tops of the heterotrophic denitrification deep-bed filter tank and the autotrophic denitrification deep-bed filter tank are respectively provided with a water inlet channel and a backwashing water discharge channel, water discharged from the bottom of the heterotrophic denitrification deep-bed filter tank is connected to the water inlet channel of the autotrophic denitrification deep-bed filter tank through a conveying pipe fitting, the conveying pipe fitting is provided with a middle water tank and a middle water pump, and the bottom of the autotrophic denitrification deep-bed filter tank is connected with a water outlet tank;
a quartz sand filter material layer is filled in the heterotrophic denitrification deep bed filter tank, and an autotrophic denitrification filter material layer containing a high-efficiency autotrophic denitrification denitrifier is filled in the autotrophic denitrification deep bed filter tank;
a supporting layer and water and gas distribution filter bricks are sequentially arranged below the quartz sand filter material layer and the autotrophic denitrification filter material layer, and gaps are reserved below the water and gas distribution filter bricks;
the bottom parts of the heterotrophic denitrification deep-bed filter tank and the autotrophic denitrification deep-bed filter tank are respectively connected with an air supply a pipe and a backwashing pipe fitting, the backwashing pipe fitting is connected to the water outlet tank, the backwashing pipe fitting is provided with a backwashing water pump, and the air supply a pipe is connected to the air supply end of the Roots blower;
the heterotrophic denitrification deep-bed filter tank and the autotrophic denitrification deep-bed filter tank are respectively provided with an embedded injection device at the filling area, and the injection devices are connected to the air supply end of the Roots blower through an air supply b pipe;
and the heterotrophic denitrification deep-bed filter tank and the autotrophic denitrification deep-bed filter tank are also provided with an adding box, and the adding box is connected to the injection device through a metering pump.
Furthermore, overflow ports with filter screen structures are arranged between the heterotrophic denitrification deep-bed filter and the quartz sand filter material layer and between the water inlet channel and the backwashing drainage channel on the two sides.
Further, the injection device comprises a plurality of injection units, and a plurality of injection units are arranged along the pond height of heterotrophic denitrification deep bed filtering pond and autotrophic denitrification deep bed filtering pond and are straight waterfall formula, and every injection unit includes fixed pipe and a plurality of pipe of burying, fixed pipe connects to air feed b pipe and I adds the case, bury the pipe array setting on fixed pipe to be linked together with fixed pipe, bury the both sides of pipe and bottom and have a plurality of filling holes along its length direction equipartition.
Furthermore, a carbon source is arranged in an adding box of the heterotrophic denitrification deep-bed filter tank, a high-efficiency autotrophic denitrification denitrifier is arranged in an adding box of the autotrophic denitrification deep-bed filter tank, and the high-efficiency autotrophic denitrification denitrifier is thiobacillus denitrificans.
Compared with the prior art, the high-efficiency autotrophic-heterotrophic coupling denitrification deep-bed filter tank adopting the technical scheme has the following beneficial effects: by adopting the high-efficiency autotrophic-heterotrophic coupling denitrification deep-bed filter, the heterotrophic denitrification deep-bed filter is combined with the autotrophic denitrification deep-bed filter, sewage sequentially passes through the two different denitrification systems to achieve the purpose of enhancing denitrification and denitrification, dissolved oxygen is reduced in the heterotrophic denitrification deep-bed filter, the autotrophic denitrification is ensured to quickly reach an anoxic condition, an inorganic carbon source is provided for the autotrophic denitrification deep-bed filter, sulfur autotrophic denitrification consumes alkalinity in the reaction process to reduce pH, and the heterotrophic denitrification generates alkalinity in the reaction process, so that the consumption of autotrophic on alkalinity can be compensated, and the acid-base balance of the system can be kept.
The invention also provides a method for treating sewage by the efficient autotrophic-heterotrophic coupling denitrification deep bed filter, which comprises the following steps:
and 3, backwashing the deep bed filter, starting the Roots blower and the backwashing water pump to perform backwashing by utilizing the cooperation of gas and water, and enabling the sewage after backwashing to flow into a backwashing drainage channel.
Compared with the prior art, the method for treating sewage by adopting the high-efficiency autotrophic-heterotrophic coupling denitrification deep-bed filter tank has the following beneficial effects:
firstly, by adopting the treatment method of the invention, the denitrification efficiency is high and the low temperature is endured through the specially domesticated autotrophic denitrifying bacteria. The total nitrogen removal rate is up to 99 percent, and the method can be used for the limit deep denitrification treatment.
The treatment method can save the operation cost and simultaneously avoid secondary pollution caused by excessive external carbon sources and the corresponding increase of the treatment cost. In addition, because the growth of the biological membrane is slower, the amount of microorganisms in the effluent is less, and convenience is brought to subsequent treatment.
And thirdly, the treatment method is simple to operate and maintain and does not need a pH adjusting system. The backwashing period of the autotrophic denitrification filter is 10-30d, and the backwashing period of the heterotrophic denitrification filter is 3-7 d.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of the internal cross-sectional structure of the heterotrophic denitrification deep-bed filter (including a quartz sand filter layer) according to the present invention;
FIG. 3 is a schematic diagram of the internal cross-sectional structure of an autotrophic denitrification deep-bed filter (containing an autotrophic denitrification filter layer) according to the present invention;
FIG. 4 is a schematic diagram of the internal structure of the heterotrophic denitrification deep-bed filter or the autotrophic denitrification deep-bed filter (without the filter material zone) according to the present invention;
fig. 5 is a partial structural view of the injection device of the present invention.
Labeled as: the device comprises a heterotrophic denitrification deep-bed filter 1, a quartz sand filter material layer 11, an adding tank 12, a metering pump 120, a water inlet channel 13, a backwashing water discharge channel 14, an observation table 15, a conveying pipe 16, a backwashing pipe 17, a gas supply pipe 18, a gas supply pipe a 19, a gas supply pipe b 20, an autotrophic denitrification deep-bed filter 2, an autotrophic denitrification filter material layer 21, an overflow port 22, a bearing layer 3, a water distribution and gas distribution filter brick 4, a Roots blower 5, an injection device 6, a fixing pipe 61, an embedded pipe 62, an inner net 63, an injection hole 64, a fender 65, a gasket 66, an intermediate water tank 7, a water outlet tank 8, an intermediate water pump 9 and a backwashing water pump 10.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. These examples are intended to illustrate the invention and are not intended to limit the scope of the invention. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "provided" and "connected" are to be interpreted broadly, e.g. as a fixed connection, a detachable connection or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The structural features of the present invention will now be described in detail with reference to the accompanying drawings.
Referring to fig. 1 and 2, a high-efficiency autotrophic-heterotrophic coupling denitrification deep-bed filter comprises a heterotrophic denitrification deep-bed filter 1 and an autotrophic denitrification deep-bed filter 2, sewage sequentially passes through the heterotrophic denitrification deep-bed filter 1 and the autotrophic denitrification deep-bed filter 2, both sides of the tops of the heterotrophic denitrification deep-bed filter 1 and the autotrophic denitrification deep-bed filter 2 are respectively provided with a water inlet channel 13 and a backwashing water discharge channel 14, overflow ports 22 with filter screen structures are respectively arranged between the heterotrophic denitrification deep-bed filter 1 and a quartz sand filter material layer 11 and the water inlet channels 13 and the backwashing water discharge channels 14 on both sides, the peripheries of the water inlet channel 13 and the backwashing water discharge channel 14 are provided with an observation platform 15 with an escalator, and an operator can perform daily maintenance on the heterotrophic denitrification deep-bed filter 1 and the autotrophic denitrification deep-bed filter 2 through the observation platform 15.
Referring to fig. 1, the bottom effluent of the heterotrophic denitrification deep-bed filter 1 is connected to an inlet channel 13 of the autotrophic denitrification deep-bed filter 2 through a conveying pipe 16, an intermediate water tank 7 and an intermediate water pump 9 are arranged on the conveying pipe 16, and an outlet water tank 8 is connected to the bottom of the autotrophic denitrification deep-bed filter 2. The heterotrophic denitrification deep-bed filter 1 is filled with a quartz sand filter material layer 11, and the autotrophic denitrification deep-bed filter 2 is filled with an autotrophic denitrification filter material layer 21 containing a high-efficiency autotrophic denitrification denitrifier. By combining the heterotrophic denitrification deep-bed filter 1 with the autotrophic denitrification deep-bed filter 2, sewage sequentially passes through the two different denitrification systems, so as to achieve the purpose of strengthening denitrification.
The heterotrophic denitrification reaction formula is as follows:
NO3 -+1.08CH3OH 0.24H2CO3One → 0.056C3H7 NO3Ten 0.47N2Eleven 1.68H2O ten HCO3 -
The autotrophic denitrification reaction formula is as follows:
55S+50NO3 -+20CO2+38H2O+4NH4 +→4C2H7NO2+25N2+55SO4 2-+64H+
from the respective reaction mechanism of the heterotrophic denitrification deep bed filter and the heterotrophic denitrification deep bed filter, a) dissolved oxygen is reduced, the autotrophic denitrification is ensured to quickly reach an anoxic condition, and meanwhile, an inorganic carbon source is provided for the autotrophic denitrification deep bed filter; b) the sulfur autotrophic denitrification consumes alkalinity in the reaction process to reduce pH, and the heterotrophic denitrification generates alkalinity in the reaction process, so that the consumption of the autotrophic denitrification on the alkalinity can be compensated, and the acid-base balance of the system is kept.
Referring to fig. 1-3, a supporting layer 3 and water and gas distribution filter bricks 4 are sequentially arranged below a quartz sand filter material layer 11 and an autotrophic denitrification filter material layer 21, and gaps are reserved below the water and gas distribution filter bricks 4; the bottom parts of the heterotrophic denitrification deep-bed filter 1 and the autotrophic denitrification deep-bed filter 2 are respectively connected with an air supply a pipe 19 and a backwashing pipe 17, the backwashing pipe 17 is connected to the water outlet tank 8, the backwashing pipe 17 is provided with a backwashing water pump 10, the air supply a pipe 19 is connected to the air supply end of the Roots blower 5, and the heterotrophic denitrification deep-bed filter 1 and the autotrophic denitrification deep-bed filter 2 are backwashed by adopting cooperation of air and water. The water back flushing is carried out by sending the water back to the bottom of the filter tank by a back flushing pump 10 and strongly washing the water back; the air washing is carried out by adopting a Roots blower 5 and carrying out air scrubbing during back washing. The backwashed sewage flows into the backwash drain channel 14.
Referring to fig. 4, the heterotrophic denitrification deep-bed filter 1 and the autotrophic denitrification deep-bed filter 2 are respectively provided with an embedded injection device 6 at the filler region, the injection device 6 is connected to the air supply end of the roots blower 5 through an air supply b pipe 20, the air supply a pipe 19 and the air supply b pipe 20 are connected to the roots blower 5 through an air supply pipe fitting 18, the air supply a pipe 19 and the air supply b pipe 20 are provided with independent control valves, and the control valves on the air supply a pipe 19 and the air supply b pipe 20 are alternately controlled to realize forward and reverse opposite air scrubbing of the filter material, so that the air scrubbing effect is further improved.
The injection device 6 is composed of a plurality of injection units, the plurality of injection units are arranged along the height of the heterotrophic denitrification deep-bed filter 1 and the autotrophic denitrification deep-bed filter 2 in a straight waterfall manner, each injection unit comprises a fixed pipe 61 and a plurality of embedded pipes 62, the fixed pipe 61 is connected to the air supply b pipe 20, two sides of the fixed pipe 61 are provided with fenders 65, the fixed pipe 61 is fixed on the outer wall of the filter through the fenders 65, a gasket 66 for sealing is arranged between the fixed pipe 61 and the filter, the embedded pipes 62 are arranged on the fixed pipe 61 in an array and communicated with the fixed pipe 61, two sides and the bottom of the embedded pipes 62 are uniformly distributed with a plurality of injection holes 64 along the length direction, an inner net 63 is arranged in the embedded pipes 62, the embedded pipes 62 can be prevented from being blocked by filter materials, the injection device 6 is arranged, firstly, a carbon source or autotrophic denitrification microbial inoculum is uniformly delivered to the filter layer, secondly, and secondly, air washing convection is formed with the air supply a pipe 19 at the bottom, the air scrubbing of the filter material layer is more thorough, in addition, the embedded pipe 62 of the layered straight waterfall structure can play a good supporting role on the filter material layer, the collapse of the filter material layer caused by consumption is avoided, meanwhile, the embedded pipe 62 is beneficial to unloading the filter material layer when high-pressure air injection is carried out, and the efficiency of replacing the filter material layer can be improved.
Referring to fig. 1, the heterotrophic denitrification deep-bed filter 1 and the autotrophic denitrification deep-bed filter 2 are further provided with an adding box 12, the adding box 12 is connected to the injection device 6 through a metering pump 120, a carbon source is arranged in the adding box 12 of the heterotrophic denitrification deep-bed filter 1, and a high-efficiency autotrophic denitrification denitrifier is arranged in the autotrophic denitrification deep-bed filter 2. Quantitatively adding a carbon source in the heterotrophic denitrification deep-bed filter 1 through a metering pump 120, wherein the carbon source is mainly used for removing most SS (suspended substances) and DO (dissolved oxygen) and providing conditions for autotrophic denitrification; the autotrophic denitrification denitrificaion bacterial agent is quantitatively inoculated in the autotrophic denitrification deep-bed filter 2 through the metering pump 120, the autotrophic denitrification denitrificaion bacterial agent is inoculated mainly for removing nitrate nitrogen in sewage, and a carbon source or the autotrophic denitrification denitrificaion bacterial agent can be uniformly conveyed to a filter material layer through the injection device 6, so that the uniform distribution of the carbon source or the autotrophic denitrification denitrificaion bacterial agent is facilitated, and the efficiency of the autotrophic-heterotrophic coupling denitrification deep-bed filter is improved.
In this embodiment, all pipe fittings are all equipped with independent control valve on business turn over port to the control of transported substance material.
The invention also provides a method for treating sewage by the efficient autotrophic-heterotrophic coupling denitrification deep bed filter, which comprises the following steps:
And 3, backwashing the deep bed filter, starting the Roots blower 5 and the backwashing water pump 10, and backwashing by using the cooperation of gas and water, wherein the sewage after backwashing flows into the backwashing drainage channel 14.
In the steps 1 and 2, the thickness of the bearing layer 3 is 400-500mm, the cobblestones are continuously distributed in five grades, the water distribution and air distribution filter bricks 4 are T-shaped filter bricks, the shell is made of high-density polyethylene (HDPE), the concrete is filled in the water distribution and air distribution filter bricks, the strength grade of the concrete is C35, and the cement is ordinary silicate with the strength of 32.5R.
Wherein, in the start-up stage of the autotrophic denitrification deep bed filter, a bacterium solution rich in thiobacillus denitrificans is inoculated, and the method for culturing the thiobacillus denitrificans bacterium solution comprises the following steps:
(1) to adjust NO3 -Preparing a culture solution by taking simulated wastewater with concentration as a main body, and adding sulfur powder under stirring;
(2) inoculating in a bioreactor, and carrying out enrichment culture on the denitrification sludge containing thiobacillus denitrificans by sodium thiosulfate;
(3) and (3) starting water inflow, flowing into the bioreactor, taking out part of culture solution in the reactor when the removal rate of nitrate in the reactor reaches 90%, and performing centrifugal separation to prepare concentrated bacterial suspension.
The specially domesticated autotrophic denitrifying bacteria have high denitrification efficiency and low temperature tolerance. The total nitrogen removal rate is up to 99 percent, and the method can be used for the limit deep denitrification treatment.
The method for treating sewage by the high-efficiency autotrophic-heterotrophic coupling denitrification deep bed filter tank can save the operation cost and simultaneously avoid secondary pollution caused by excessive external carbon sources and the corresponding increase of the treatment cost. In addition, because the growth of the biological membrane is slower, the amount of microorganisms in the effluent is less, and convenience is brought to subsequent treatment. The operation and maintenance are simple, and a pH adjusting system is not needed. The backwashing period of the autotrophic denitrification filter is 10-30d, and the backwashing period of the heterotrophic denitrification filter is 3-7 d.
Example 1
2000t/d secondary biochemical treatment tail water (total nitrogen of inlet water is 40mg/L, COD is 40mg/L, and total phosphorus is 0.4mg/L), and the total nitrogen is removed by adopting a high-efficiency autotrophic-heterotrophic coupling denitrification deep bed filter technology. When the adding amount of sodium acetate is 1/4 of theoretical adding amount, the retention time of the heterotrophic denitrification deep bed filter is 0.4h, and the retention time of the autotrophic denitrification deep bed filter is 0.8h, the total nitrogen concentration of effluent is 3.5mg/L, the removal rate reaches more than 91%, the COD effluent is 25mg/L, and the first-class A discharge standard (GB 1/4-1996) is reached.
Example 2
5000t/d secondary biochemical treatment tail water (total nitrogen of inlet water is 35mg/L, COD is 35mg/L, and total phosphorus is 0.3mg/L) and a high-efficiency autotrophic-heterotrophic coupling denitrification deep bed filter tank technology is adopted to remove the total nitrogen. When the adding amount of sodium acetate is 1/4 of theoretical adding amount, the retention time of the heterotrophic denitrification deep-bed filter is 0.45h, and the retention time of the autotrophic denitrification deep-bed filter is 0.9h, the total nitrogen concentration of effluent is 2.5mg/L (the removal rate is more than 92%), COD effluent is 20mg/L, and the effluent reaches the first-class A discharge standard (GB 1/4-1996).
Example 3
10000t/d of secondary biochemical treatment tail water (total nitrogen of inlet water is 30mg/L, COD is 30mg/L, and total phosphorus is 0.2mg/L), and the total nitrogen is removed by adopting an efficient autotrophic-heterotrophic coupling denitrification deep bed filter technology. When the adding amount of sodium acetate is 1/4 of theoretical adding amount, the retention time of the heterotrophic denitrification deep bed filter is 0.5h, and the retention time of the autotrophic denitrification deep bed filter is 1h, the total nitrogen concentration of effluent is 3mg/L (the removal rate reaches 90%), the COD effluent is 12mg/L, and the effluent reaches the first-grade A discharge standard (GB 1/4-1996).
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A high-efficiency autotrophic-heterotrophic coupling denitrification deep-bed filter is characterized by comprising a heterotrophic denitrification deep-bed filter (1) and an autotrophic denitrification deep-bed filter (2), sewage sequentially passes through the heterotrophic denitrification deep-bed filter (1) and the autotrophic denitrification deep-bed filter (2), both sides of the tops of the heterotrophic denitrification deep-bed filter (1) and the autotrophic denitrification deep-bed filter (2) are respectively provided with a water inlet channel (13) and a backwashing water discharge channel (14), water discharged from the bottom of the heterotrophic denitrification deep-bed filter (1) is connected to the water inlet channel (13) of the autotrophic denitrification deep-bed filter (2) through a conveying pipe (16), a middle water tank (7) and a middle water pump (9) are arranged on the conveying pipe (16), and a water outlet tank (8) is connected to the bottom of the autotrophic denitrification deep-bed filter (2);
a quartz sand filter material layer (11) is filled in the heterotrophic denitrification deep-bed filter (1), and an autotrophic denitrification filter material layer (21) containing a high-efficiency autotrophic denitrification denitrifier is filled in the autotrophic denitrification deep-bed filter (2);
a supporting layer (3) and water and gas distribution filter bricks (4) are sequentially arranged below the quartz sand filter material layer (11) and the autotrophic denitrification filter material layer (21), and gaps are reserved below the water and gas distribution filter bricks (4);
the bottom parts of the heterotrophic denitrification deep-bed filter (1) and the autotrophic denitrification deep-bed filter (2) are respectively connected with an air supply a pipe (19) and a backwashing pipe fitting (17), the backwashing pipe fitting (17) is connected to the water outlet tank (8), the backwashing pipe fitting (17) is provided with a backwashing water pump (10), and the air supply a pipe (19) is connected to the air supply end of the Roots blower (5);
the heterotrophic denitrification deep-bed filter (1) and the autotrophic denitrification deep-bed filter (2) are respectively provided with an embedded injection device (6) at the filling area, and the injection devices (6) are connected to the air supply end of the Roots blower (5) through an air supply b pipe (20);
the heterotrophic denitrification deep-bed filter (1) and the autotrophic denitrification deep-bed filter (2) are further provided with an adding box (12), and the adding box (12) is connected to the injection device (6) through a metering pump (120).
2. The high-efficiency autotrophic-heterotrophic coupling denitrification deep-bed filter according to claim 1, wherein overflow ports (22) with filter screen structures are arranged between the heterotrophic denitrification deep-bed filter (1) and the quartz sand filter material layer (11) and the water inlet channel (13) and the backwashing water discharge channel (14) on both sides.
3. The high-efficiency autotrophic-heterotrophic coupling denitrification deep-bed filter according to claim 1, wherein the injection device (6) is composed of a plurality of injection units, the plurality of injection units are arranged in a straight waterfall manner along the height of the heterotrophic denitrification deep-bed filter (1) and the autotrophic denitrification deep-bed filter (2), each injection unit comprises a fixed pipe (61) and a plurality of buried pipes (62), the fixed pipe (61) is connected to the gas supply pipe (20) and the addition tank (12), the buried pipes (62) are arranged on the fixed pipe (61) in an array manner and communicated with the fixed pipe (61), and a plurality of injection holes (64) are uniformly distributed on two sides and the bottom of the buried pipes (62) along the length direction.
4. The high-efficiency autotrophic-heterotrophic coupling denitrification deep-bed filter according to claim 1, wherein a carbon source is arranged in the adding tank (12) of the heterotrophic denitrification deep-bed filter (1), and a high-efficiency autotrophic denitrification denitrifier is arranged in the adding tank (12) of the autotrophic denitrification deep-bed filter (2).
5. A method for treating sewage by using a high-efficiency autotrophic-heterotrophic coupling denitrification deep bed filter according to any one of claims 1 to 4, which is characterized by comprising the following steps:
step 1, heterotrophic denitrification of sewage, wherein the sewage firstly enters the heterotrophic denitrification deep-bed filter (1) through a water inlet channel (13) at the side part of the heterotrophic denitrification deep-bed filter (1), meanwhile, a carbon source is added into a quartz sand filter material layer (11) through an adding box (12), and the sewage sequentially flows through the quartz sand filter material layer (11), a supporting layer (3) and a water and gas distribution filter brick (4) in a downward flow mode and finally flows out from the bottom of the heterotrophic denitrification deep-bed filter (1);
step 2, autotrophic denitrification of sewage, namely, the effluent of the heterotrophic denitrification deep-bed filter (1) automatically flows into an intermediate water tank (7), is lifted into a water inlet channel (13) at the side part of the autotrophic denitrification deep-bed filter (2) through an intermediate water pump (9), then flows into the autotrophic denitrification deep-bed filter (2) through an overflow port (22), meanwhile, an autotrophic denitrification denitrifier is inoculated in an autotrophic denitrification filter layer (21) through an adding box (12), and sewage sequentially flows through the autotrophic denitrification filter layer (21), a supporting layer (3) and a water and gas distribution filter brick (4) in a downward flow mode, finally flows out of the bottom of the autotrophic denitrification deep-bed filter (2) and flows into a water outlet tank (8);
and 3, backwashing the deep bed filter, starting the Roots blower (5) and the backwashing water pump (10) to perform backwashing by using the cooperation of gas and water, and enabling the sewage after backwashing to flow into a backwashing drainage channel (14).
6. The wastewater treatment according to claim 5The method is characterized in that the quartz sand filter material layer (11) is made of homogeneous quartz sand, the height of the quartz sand filter material layer (11) is 1.8-2.5m, the effective grain diameter is 2-3 mm, the uniformity coefficient is 1.4, the sphericity is not less than 0.8, the Mohs hardness is 6-7, and the specific gravity is not less than 2.6g/cm3The acid solubility does not exceed 3%.
7. The wastewater treatment method according to claim 5, wherein the thickness of the supporting layer (3) is 400-500mm, and five continuous grading distributions of cobblestones are adopted.
8. The sewage treatment method according to claim 5, wherein the water distribution and air distribution filter bricks (4) are T-shaped filter bricks, the outer shell is made of High Density Polyethylene (HDPE), the interior of the T-shaped filter bricks is filled with concrete, the strength grade of the concrete is C35, and the cement is made of ordinary silicate with the strength of 32.5R.
9. The sewage treatment method according to claim 5, wherein the autotrophic denitrification filter layer (21) is irregular particles formed by stirring, mixing and modifying inorganic materials of elemental sulfur powder, medical stone powder and calcium carbonate powder at the high temperature of 130-160 ℃, and has the particle diameter of 5-20mm and the bulk density of 1200kg/m3。
10. The wastewater treatment method according to claim 5, wherein in step 1, the carbon source is sodium acetate, and in step 2, the autotrophic denitrification denitrifier is Thiobacillus denitrificans.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110063451.XA CN113149201A (en) | 2021-01-18 | 2021-01-18 | Efficient autotrophic-heterotrophic coupling denitrification deep bed filter and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110063451.XA CN113149201A (en) | 2021-01-18 | 2021-01-18 | Efficient autotrophic-heterotrophic coupling denitrification deep bed filter and method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113149201A true CN113149201A (en) | 2021-07-23 |
Family
ID=76878418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110063451.XA Pending CN113149201A (en) | 2021-01-18 | 2021-01-18 | Efficient autotrophic-heterotrophic coupling denitrification deep bed filter and method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113149201A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113955902A (en) * | 2021-11-01 | 2022-01-21 | 绿源(北京)环保设备股份有限公司 | Method and system for advanced treatment of sewage |
| CN115321680A (en) * | 2022-10-18 | 2022-11-11 | 北京涞澈科技发展有限公司 | Medical stone-doped carbon-sulfur integrated material and preparation method thereof |
| CN117164111A (en) * | 2023-11-03 | 2023-12-05 | 深圳市碧园环保技术有限公司 | Deep denitrification process for low carbon nitrogen ratio wastewater |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102689988A (en) * | 2012-04-27 | 2012-09-26 | 湖北理工学院 | Carbon-oxygen combined regulatory denitrification system for horizontal underflow constructed wetlands |
| CN203486956U (en) * | 2013-08-13 | 2014-03-19 | 广东森海环保装备工程有限公司 | Improved biological aerated filter |
| CN106495323A (en) * | 2016-11-07 | 2017-03-15 | 中国科学院生态环境研究中心 | Heterotrophism autotrophy series connection denitrification removes the method and device of nitrate in breeding seawater |
| CN106946343A (en) * | 2017-05-03 | 2017-07-14 | 山东毅康科技股份有限公司 | A kind of efficiently backwash BAF |
| CN109592788A (en) * | 2019-01-22 | 2019-04-09 | 湖南中科环保技术有限公司 | A kind of efficient denitrification filters sewage disposal system ecologically |
| CN111252896A (en) * | 2020-03-12 | 2020-06-09 | 安庆创益环保有限公司 | Sulfur autotrophic material for removing nitrate from underground water and preparation method thereof |
| CN111977787A (en) * | 2020-08-10 | 2020-11-24 | 深圳市播绿者生态科技股份有限公司 | Self-activated denitrification carrier material and preparation method and application thereof |
-
2021
- 2021-01-18 CN CN202110063451.XA patent/CN113149201A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102689988A (en) * | 2012-04-27 | 2012-09-26 | 湖北理工学院 | Carbon-oxygen combined regulatory denitrification system for horizontal underflow constructed wetlands |
| CN203486956U (en) * | 2013-08-13 | 2014-03-19 | 广东森海环保装备工程有限公司 | Improved biological aerated filter |
| CN106495323A (en) * | 2016-11-07 | 2017-03-15 | 中国科学院生态环境研究中心 | Heterotrophism autotrophy series connection denitrification removes the method and device of nitrate in breeding seawater |
| CN106946343A (en) * | 2017-05-03 | 2017-07-14 | 山东毅康科技股份有限公司 | A kind of efficiently backwash BAF |
| CN109592788A (en) * | 2019-01-22 | 2019-04-09 | 湖南中科环保技术有限公司 | A kind of efficient denitrification filters sewage disposal system ecologically |
| CN111252896A (en) * | 2020-03-12 | 2020-06-09 | 安庆创益环保有限公司 | Sulfur autotrophic material for removing nitrate from underground water and preparation method thereof |
| CN111977787A (en) * | 2020-08-10 | 2020-11-24 | 深圳市播绿者生态科技股份有限公司 | Self-activated denitrification carrier material and preparation method and application thereof |
Non-Patent Citations (2)
| Title |
|---|
| 王民浩等编著: "《中国水环境治理产业发展研究报告》", 31 March 2020, 中国环境出版集团 * |
| 马爱霞, 中国医药科技出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113955902A (en) * | 2021-11-01 | 2022-01-21 | 绿源(北京)环保设备股份有限公司 | Method and system for advanced treatment of sewage |
| CN115321680A (en) * | 2022-10-18 | 2022-11-11 | 北京涞澈科技发展有限公司 | Medical stone-doped carbon-sulfur integrated material and preparation method thereof |
| CN117164111A (en) * | 2023-11-03 | 2023-12-05 | 深圳市碧园环保技术有限公司 | Deep denitrification process for low carbon nitrogen ratio wastewater |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107540094B (en) | Constructed wetland sewage treatment system | |
| CN113149201A (en) | Efficient autotrophic-heterotrophic coupling denitrification deep bed filter and method thereof | |
| CN104129893B (en) | Acetylbutyrylcellulose produces the processing method of waste water | |
| CN214528587U (en) | Rural domestic sewage treatment system of nitrogen and phosphorus removal integration | |
| WO2021253637A1 (en) | A/o-mbbr process-based integrated sewage treatment device and sewage treatment method | |
| CN101698556A (en) | Treatment method and treatment device of wastewater from middle stage of wheat straw pulp paper-making | |
| CN109942156B (en) | Biological filter based mariculture tail water treatment system and application method thereof | |
| CN101407360A (en) | Method for processing waste water of circulating marine culture by using artificial wet land | |
| CN108503136A (en) | River regulation system | |
| CN114634276A (en) | Nitrogen and phosphorus removal integrated rural domestic sewage treatment system and treatment method thereof | |
| CN218910039U (en) | Efficient mud membrane symbiotic denitrification and dephosphorization sewage treatment system | |
| CN207158888U (en) | Immersion black and odorous water in-situ treatment device | |
| CN216808519U (en) | Drinking water pretreatment system applying microorganisms and ecological purification process | |
| CN112744912A (en) | Sulfur autotrophic denitrification biological filter, sewage treatment system and treatment method thereof | |
| CN208234621U (en) | The multistage composite biofilm reactor in situ for administering black and odorous water | |
| CN107827324B (en) | Urban sewage comprehensive treatment system | |
| CN103896452A (en) | Equipment and method for removing nitrogen out of domestic wastewater | |
| CN110776219A (en) | Advanced treatment device for printing and dyeing wastewater pollutants and application thereof | |
| CN109970198A (en) | Utilize the device and sewage water treatment method of heavy caliber trunk sewer road processing sewage | |
| CN201581027U (en) | Purifying device for river sewage treatment | |
| CN211644786U (en) | Biochemical wetland ecological purification system for new rural domestic sewage | |
| CN105236575B (en) | It is a kind of that stream process is made using circulation and repairs the device and method of polluted-water | |
| CN210595462U (en) | Double-chamber artificial rapid infiltration sewage purification system | |
| CN210764840U (en) | Distributed micro-power sewage treatment device and sewage treatment system comprising same | |
| CN209702393U (en) | Modified form bio-contact oxidation integrated sewage treating apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210723 |